# intersection of 2 graphs

1. ## intersection of 2 graphs

I plotted 2 sets of data on the same set of axes.. now I need to find the
intersection point of the two trendlines. Please let me know how I can do
this (if I can)?

This is probably very trivial.. really appreciate all the help.

Thanks!

2. ## Re: intersection of 2 graphs

Hi,

Have a look at this explanation.
http://www.andypope.info/charts/intersection.htm

Cheers
Andy

utopian_sorceror wrote:
> I plotted 2 sets of data on the same set of axes.. now I need to find the
> intersection point of the two trendlines. Please let me know how I can do
> this (if I can)?
>
> This is probably very trivial.. really appreciate all the help.
>
> Thanks!

--

Andy Pope, Microsoft MVP - Excel
http://www.andypope.info

3. ## Re: intersection of 2 graphs

formula is evaluating to an error though. apparently, excel doesn't
understand what is "lineb", could you explain further pls?

also, would this method work when I'm not using line segments between data
points, but an exponential trendline for the entire set?

if it helps, i'm trying to do load line analysis of a resistor and a diode..
so I have this exponential looking graph and this straight line and I need to
find where they intersect

thanks so much! really appreciate.

"Andy Pope" wrote:

> Hi,
>
> Have a look at this explanation.
> http://www.andypope.info/charts/intersection.htm
>
> Cheers
> Andy
>
> utopian_sorceror wrote:
> > I plotted 2 sets of data on the same set of axes.. now I need to find the
> > intersection point of the two trendlines. Please let me know how I can do
> > this (if I can)?
> >
> > This is probably very trivial.. really appreciate all the help.
> >
> > Thanks!

>
> --
>
> Andy Pope, Microsoft MVP - Excel
> http://www.andypope.info
>

4. ## Re: intersection of 2 graphs

Hi,

LineB is a named range. In the example check under the menu Insert >
Names > Define.

If you want to do intersects of a trend line then you will need to
generate some x and y values for the trendline and use those.
Use LINEST for this purpose
http://www.stfx.ca/people/blie ngme/ExcelTips/Polynomial.htm

Cheers
Andy

utopian_sorceror wrote:
> formula is evaluating to an error though. apparently, excel doesn't
> understand what is "lineb", could you explain further pls?
>
> also, would this method work when I'm not using line segments between data
> points, but an exponential trendline for the entire set?
>
> if it helps, i'm trying to do load line analysis of a resistor and a diode..
> so I have this exponential looking graph and this straight line and I need to
> find where they intersect
>
> thanks so much! really appreciate.
>
> "Andy Pope" wrote:
>
>
>>Hi,
>>
>>Have a look at this explanation.
>>http://www.andypope.info/charts/intersection.htm
>>
>>Cheers
>>Andy
>>
>>utopian_sorceror wrote:
>>
>>>I plotted 2 sets of data on the same set of axes.. now I need to find the
>>>intersection point of the two trendlines. Please let me know how I can do
>>>this (if I can)?
>>>
>>>This is probably very trivial.. really appreciate all the help.
>>>
>>>Thanks!

>>
>>--
>>
>>Andy Pope, Microsoft MVP - Excel
>>http://www.andypope.info
>>

--

Andy Pope, Microsoft MVP - Excel
http://www.andypope.info

5. ## Re: intersection of 2 graphs

ok i think i get it :D thanks so much again.. i'll go fiddle with my data...

"Andy Pope" wrote:

> Hi,
>
> LineB is a named range. In the example check under the menu Insert >
> Names > Define.
>
> If you want to do intersects of a trend line then you will need to
> generate some x and y values for the trendline and use those.
> Use LINEST for this purpose
> http://www.stfx.ca/people/blie ngme/ExcelTips/Polynomial.htm
>
> Cheers
> Andy
>
> utopian_sorceror wrote:
> > formula is evaluating to an error though. apparently, excel doesn't
> > understand what is "lineb", could you explain further pls?
> >
> > also, would this method work when I'm not using line segments between data
> > points, but an exponential trendline for the entire set?
> >
> > if it helps, i'm trying to do load line analysis of a resistor and a diode..
> > so I have this exponential looking graph and this straight line and I need to
> > find where they intersect
> >
> > thanks so much! really appreciate.
> >
> > "Andy Pope" wrote:
> >
> >
> >>Hi,
> >>
> >>Have a look at this explanation.
> >>http://www.andypope.info/charts/intersection.htm
> >>
> >>Cheers
> >>Andy
> >>
> >>utopian_sorceror wrote:
> >>
> >>>I plotted 2 sets of data on the same set of axes.. now I need to find the
> >>>intersection point of the two trendlines. Please let me know how I can do
> >>>this (if I can)?
> >>>
> >>>This is probably very trivial.. really appreciate all the help.
> >>>
> >>>Thanks!
> >>
> >>--
> >>
> >>Andy Pope, Microsoft MVP - Excel
> >>http://www.andypope.info
> >>

>
> --
>
> Andy Pope, Microsoft MVP - Excel
> http://www.andypope.info
>

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